Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1994-08-03
1996-06-11
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
25036303, G01T 1164
Patent
active
055258034
ABSTRACT:
An object of the present invention is to provide a radiation site detector which can detect a position of an incident scintillator with high precision by excluding the effect of Compton scattering. The radiation site detector is provided with a scintillator array having a plurality of scintillators into which a radiation is made incident, and a photodetector for converting scintillations occurring in the scintillators to independent photoelectric conversion signals to output them. A level of each of photoelectric conversion signals output from a specific scintillator to be judged whether the radiation has been incident thereinto, and from a plurality of scintillators around the specific scintillator, is compared with a plurality of threshold values different from one another so as to determine whether the levels are within or outside a window defined by the threshold values. Then, it is judged whether the above specific scintillator is a scintillator into which the radiation has been incident based on the characteristics of a signal pattern obtained in the above comparison.
REFERENCES:
patent: 4258428 (1981-03-01), Woronowicz
Thompson, "The Effects of Detector Material and Structure on Pet Spatial Resolution and Efficiency", Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada, 6 pages.
Lecornte et al, "Potentials of Multispectral Acquisition in Positron Emission Tomography", Department of Nuclear Medicine and Radiobiology, Universite de Sherbrooke, Quebec, Canada, J1H 5N4, 3 pages.
Cho et al, "Resolution and Sensitivity Improvement in Positron Emission Tomography by the First Interaction Point Determination", Department of Radiological Sciences, University of California, Irvine, CA 92717, pp. 1-12.
Uchida Hiroshi
Watanabe Mitsuo
Hamamatsu Photonics K.K.
Hanig Richard
Willis Davis L.
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